Toilet Cleaner Dispenser with Directed Substance Release

ABSTRACT

The invention relates to a toilet cleaner dispenser for introducing at least one substance preparation into a toilet bowl, comprising at least one container containing a first preparation, said container being connectable to the toilet cleaner dispenser, wherein the toilet cleaner dispenser comprises at least one dispenser element for at least one substance preparation, wherein the dispenser element is connected in a communicating fashion to the container and is configured such that a substance is released into at least one area of application on the interior of the toilet bowl.

CROSS REFERENCE TO RELATED APPLICATIONS

The present application is a continuation of International PatentApplication No. PCT/EP2008/054198 filed 8 Apr. 2008, which claimspriority to German Patent Application No. 10 2007 040 328.5 filed 24Aug. 2007, both of which are incorporated herein by reference.

The present invention relates to a toilet freshener withelectromechanically effected, directed release of preparations into oron a toilet bowl.

Accurate dispensing of flowable or pourable compositions is relevant ina large number of fields of application.

Domestically, dispensing of flowable substances is increasing inimportance, based primarily on exact, controlled dispensing of activesubstances so that the environment is protected by conservation ofresources and prevention of incorrect or over-dispensing, whileefficiency of the active substances dispensed in this way is optimized.

Dispensing of cleaning and fragrancing compositions in the toilet areais currently effected primarily by “toilet fresheners”. These aresingle- or multi-chamber containers which are hung in the toilet bowl sothat an active substance is released from the toilet freshener into thetoilet bowl during the flushing process of flushing the toilet bowl withwater.

Such devices are known, for example, from EP0828902 or DE10113036.

A significant disadvantage of these toilet fresheners is that dispensingdepends substantially on local flow conditions in the toilet bowl duringthe flushing process. However, flow conditions can vary widely,depending on the type of toilet and positioning of the toilet freshenerin or on the toilet bowl. For example, with certain toilets it ispossible that no active substance is released from the toilet freshenerdue to no or insufficient water flowing over the toilet freshener duringthe flushing process, resulting in the dispensing mechanism of thetoilet freshener not being initiated.

Also, if flush water flows over a toilet freshener as intended, this canbe problematic as the water path intended by the toilet manufacturer canbe disturbed, negatively affecting the flushing performance of a toilet.

It is therefore desirable to have a dispensing device for releasingactive substances into a toilet bowl which dispenses those substancesinto the bowl independent of the toilet flushing process.

Toilet fresheners known in the art supply a solid or gel-form activesubstance and are arranged under the rim of the toilet bowl directly inthe flush water stream. Active substances are usually released from suchtoilet fresheners due penetration of flush water through openings in thetoilet freshener, wherein the active substances are partially dissolvedand discharged by and swept away from the toilet freshener when theflush water exits through corresponding outlet openings. Depending onhow the toilet freshener is arranged in the toilet, the strength of flowthrough it can vary due to locally very different flow conditionsinvolved in flush water outlet from the toilet bowl rim, whereby only aslight release of the active substances is achieved.

Typically, the active substance/flush water mixture, once released, doesnot flow over the side of the toilet opposite the toilet freshener,resulting in only a partial cleaning of the toilet bowl surface.

Also, the time in which the toilet bowl surface is exposed to thereleased active substances during a flushing process is relativelyshort, requiring high concentrations or quantities of active substancesto be released and introduced into the flush water for effective wettingor cleaning of the surface, which is problematic with respect toresources, costs and the environment. It is therefore desirable toincrease the exposure time of the toilet bowl surface to the releasedactive substances.

The present invention provides a solution to the disadvantages of theabove-described toilet fresheners, providing a toilet freshener whichprovides defined, directed release of active substances into a toiletbowl.

This is achieved by a toilet freshener having a power source, controlunit, sensor unit, at least one first container containing a firstpreparation, wherein the first container can be coupled to the toiletfreshener, and at least one release element. The at least one releaseelement can release at least one active substance preparation, with therelease element being connected in communicating manner to the containerand configured in such a way that active substance is released onto atleast one application field located inside the toilet bowl.

The advantages of the invention include more specific exposure of toiletbowl surfaces to one or more active substances. Further, differentsurfaces can be treated with different active substances. For example,considering a German style flat-pan toilet, the pan area of the toiletcan be wetted with an active substance for reducing adhesions, while anactive substance for reducing lime deposits can be applied onto thefunnel-shaped walls extending from the pan to the rim of the toilet.

The toilet freshener according to the invention consists of variouscomponents which may in turn be combined into assemblies. Thesecomponents include at least one pump, a release element, a control unit,a sensor unit, a power source, a container, a fastening means and apreparation. In a preferred embodiment, the pump, control unit, sensorunit and power source are combined into a “dispenser” assembly. Thecomponents and assemblies are described below.

Dispenser

The dispenser can include the power source needed to operate the toiletfreshener, its control unit, sensor unit and at least one pump.Preferably, the dispenser includes a housing for protection from watersplashing into the interior of the dispenser, as may occur when thetoilet freshener is used in a toilet bowl.

It is also preferred to have the dispenser arranged on the outer rim ofthe toilet bowl, further enabling protection from exposure to watersplashes as well as convenient operation of the dispenser. In addition,by having a dispenser that does not project into the interior of thetoilet, the useful cross-sectional area of the toilet bowl is notreduced.

Since, depending on their intended purpose, dispensable preparations canhave a pH value of from 2 to 12, any components of the toilet freshenerwhich contacts these preparations should have appropriate acid and/oralkali resistance. In addition, suitable material selection shouldensure that these components are as far as possible chemically inert(e.g., in relation to nonionic surfactants, enzymes and/or fragrances).

It is particularly advantageous for electrical components of the toiletfreshener such as the power source, control unit and sensor unit, to beencapsulated or housed separately or together so that the dispenser issubstantially water-tight (i.e., the dispenser is functional even whencompletely surrounded by liquid). Examples of useful encapsulationmaterials include multicomponent epoxide and acrylate encapsulationcompounds such as methacrylate esters, urethane meth- and cyanoacrylatesor two-component materials comprising polyurethanes, silicones, epoxyresins.

A significant advantage of the invention is the separation of the toiletfreshener into a dispenser and a container coupled with the dispenser,whereby the toilet freshener is flexible and adapted for the widestpossible range of applications.

Pump

For the present application, a pump is a fluid power machine for movingor delivering a fluid in particular small quantities by convertingmechanical drive power into flow power.

Fluids are understood below to be liquids and gases, and mixturesthereof and with solids.

Pumps include positive-displacement pumps, oscillatory pumps, diaphragmpumps, piston pumps, rotary pumps, dynamic pumps, centrifugal pumps,electrohydrodynamic pumps, electroosmotic pumps, magnetohydrodynamicpumps, surface acoustic wave pumps, capillary pumps, electrowettingpumps, thermocapillary pumps.

The pump is either connected directly to the power source or the controlunit is interposed therebetween.

In a further embodiment of the invention the release of at least onepreparation can occur merely by gravity without use of a pump. Releaseof preparation from the container into the surrounding environment canbe controlled in this configuration, for example, by a valve which opensto release the preparation and closes to prevent release. The valve canbe controllable directly by the power source or by the control unitconnected therebetween.

The pump, sensor and control unit are advantageously configured so thata defined amount of active substance preparation is released into thetoilet bowl irrespective of the arrangement of the toilet freshener inor on the toilet bowl and/or of the amount of flush water to which thetoilet freshener is exposed.

The pump likewise makes it possible for at least two different, definedamounts of at least one active substance preparation to be released. Asignificant advantage of this embodiment of the invention is that activesubstances are dispensed into the toilet bowl in a manner appropriate torequirements, thereby achieving active substance use which is moreeffective and better conserves resources.

In a further development of the invention, the pump is configured sothat it is able to release an active substance preparation with aviscosity of <5000 mPa·s.

Micropump

Delivery rate of a micropump amounts conventionally to from 50 nl to 100ml per minute, preferably from 250 nl to 30 ml per minute, particularlypreferably from 500 nl to 5 ml per minute.

Preferably the micropump has a structural volume of about 5 cm³ or less,particularly preferably of about 3 cm³ or less, particularly preferablyof about 2 cm³ or less.

The specific delivery rate of a micropump (calculated from the ratio ofthe delivery rate to the structural volume of a micropump) is typicallyabout 500 [l/min] or less. The specific delivery rate preferably liesfrom 1 to 300, particularly preferably from 1.5 to 200, particularlypreferably from 2 to 150, very particularly preferred from 2.5 to 100l/min.

Diaphragm Pumps

Diaphragm pumps are particularly useful for dispensing cleaning andactive substance preparations as well as fragrances.

Diaphragm pumps typically include an inlet valve and an outlet valverespectively leading into and out of a pump chamber, formed in part froma pump diaphragm, and an actuator.

When the inlet valve is closed, the actuator causes compression of thepump chamber by acting mechanically on the pump diaphragm, resulting inthe fluid located in the pump chamber being delivered out of the pumpchamber via the open outlet valve.

Once the discharge process is complete, the outlet valve is closed anddecompression of the pump chamber is effected by the actuator, resultingin fluid being drawn into the pump chamber via the now open inlet valve.

By suitable configuration and/or control of the valves and of theactuator, delivery direction of the micropump can be influenced orreversed.

The diaphragm pump actuator can be electromotive, piezoceramic,bimetallic, memory metallic, pneumatic, peristaltic, electrostatic,electromagnetic or thermal drive units.

The valves can be active or passive valves. Passive valves include clackvalves, diaphragm valves or no-moving-parts valves.

Depending on the field of application, pressure-side release of thepreparation from the dispensing device can occur dropwise, as a jet orspray, by diffusion or by vaporization.

For preparations having a tendency to form deposits over extendedstorage, it may be advantageous to arrange the container housing thepreparation on the pressure side of the pump. In this configuration,only a fluid containing no deposit-forming substances is deliveredthrough the pump. In this case, it is particularly advantageous to useair as the fluid.

The fluid is pumped into the container under pressure. The container hasa pressure equalizing valve which, when a defined pressure in thecontainer is exceeded, allows the product to flow out of the container.

This allows use of the dispenser for a variety of preparations withoutjeopardizing the functionality of the pump due to possible deposits orreactions between two preparations.

Release Elements

Release elements are any kind of device suitable for releasing an activesubstance into the surrounding environment of the dispensing device.

Release elements can include nozzles, spray heads, droplet dispensers,foam spray heads, piezo elements, porous elements, wick systems,capillary systems, nebulizers, ultrasound nebulizers, ionizationnebulizers, etc.

Nozzles, spray heads, droplet dispensers, foam spray heads, piezoelements and the like are particularly suitable for releasing activesubstances into the toilet or onto the interior surfaces of the toiletbowl.

Nozzles, atomizers, spray heads, piezo elements, sintered plates, porouselements, wick systems and the like are particularly suitable for activesubstance preparation release into the air.

Release elements can have the same or different spray cone shapes whenreleasing the preparations. Accordingly, it is possible for one releaseelement to produce a jet with a somewhat narrow or directed applicationarea, while another release element produces a broad application field.Obviously, various combinations of the most varied spray cone shapes areconceivable.

In particular, the release element can be arranged in a movable manneron the toilet freshener that allows the user to orient the spray conefrom the release element onto a desired application field. The releaseelement can also permit adjustment of the spray cone shape.

The release element can also provide electrostatic charging of activesubstance droplets, thereby improving the wetting, adhesion and/ordistribution of the active substance on a surface and/or in the air.

The release element can also be constructed as a fan configured eitherto improve air quality by drawing in malodors or optimize activesubstance distribution in or on the toilet bowl.

Release elements can further be configured so that one or more activesubstances are released in different directions from one another. Thefollowing table provides a non-exhaustive list of some possibleconfigurations regarding the direction of release.

Direction of release A Direction of release B Release of fragrance intoRelease of fragrance into toilet bowl surrounding environment Release ofcleaning agent Release of cleaning agent under into toilet bowl thetoilet rim/during flushing or outside the flushing process Release ofcleaning agent Release of fragrance into into toilet bowl surroundingenvironment

Further desired combinations of the configurations shown in the abovetable are also possible.

It is advantageous to arrange the release element in a movable manner onthe clip of the toilet freshener. Doing so allows the user to orient therelease element and spray cone of the preparation in order to wet adefined application field in or on the toilet with preparation.

The release element(s) is/are advantageously configured such that,irrespective of the positioning of the toilet freshener on the toiletbowl, a defined amount of at least one active substance preparation isreleased in a directed and defined manner into the interior of a toiletbowl. Advantages of such a development include more specific exposure ofsurfaces of the toilet bowl to one or more active substances, as well asthe ability to treat different surfaces with different activesubstances. For example, considering a German style flat-pan toilet, thepan portion can be wetted with an active substance for reducingadhesions, while an active substance for reducing lime deposits can beapplied onto the funnel-shaped walls extending from the pan to the rimof the toilet.

In a further, preferred embodiment of the invention the control unitgenerates a control signal for releasing active substance preparationwhen flushing is initiated and a control signal for terminating activesubstance release once flush water has stopped flowing through thetoilet bowl.

In a further development of the toilet freshener, the first amountreleased and at least the second amount released originate fromidentical or different active substance preparations.

According to a further, preferred embodiment, the first amount releasedand at least the second amount released are released at different pointsin time.

In a further development of the invention, the release element and atleast the first preparation are configured so that foam is formed whenthe preparation is released into the surrounding environment.

In a further, alternative development of the invention, the pump, therelease element and at least the first preparation are configured sothat foam is formed when the preparation is released into thesurrounding environment.

Foaming provides a variety of advantages. For example, foam caneffectively trap and minimize malodors due to its pore and cellstructure. Also, foam can be applied onto the surface of the toilet bowlas an “anti-caking” coating in order to reduce adhesions of excretedmetabolites to these surfaces.

It is therefore advantageous for the release element to take the form ofa foam spray head, and for the preparation to have a viscosity of lessthan about 3000 mPa·s, so that a maximally stable, effectively adheringand fine-pored foam can be formed.

Control Unit

A control unit in the present application is a device suitable forinfluencing the transport of material, energy and/or information. Tothis end, the control unit acts on transducers with information which itprocesses for achieving the control objective.

Transducers can include, for example, pumps and/or valves.

In a preferred development of the invention the toilet freshener doesnot make use of any mechanical control elements for product release,enabling the toilet freshener to be miniaturized so that it may also beused in applications in which the size of the toilet freshener iscritical.

The control unit can include a programmable microprocessor. In aparticularly preferred embodiment of the invention, a plurality ofdispensing programs are stored in the microprocessor for selection andexecution depending on the container coupled to the toilet freshener. Itis also possible for the dispensing programs to be manually invoked bythe user.

The control unit is preferably arranged on the outwardly facing side ofthe toilet bowl, allowing it to be operated by the user, in particular,when the user is sitting on the toilet.

In a particularly preferred embodiment, the control unit has adispensing program for introducing at least two different activesubstance preparations into a toilet bowl or into the surroundingenvironment of the toilet bowl, wherein in at least two successivepoints in time t₁ and t₂ at least two different active substancepreparations are released, with at least one active substancepreparation introduced into the interior of a toilet bowl.

Such a dispensing program allows optimized cleaning performance due tocontrol of possible chemical reactions based on appropriatelytime-offset release of the corresponding preparation or preparations,some examples of which are listed in the following table.

t₁ t₂ Advantage Cleaning product Fragrance in Optimized fragrancedevelopment, since fragrance is in toilet bowl toilet bowl afterreleased into the toilet bowl after flushing and is during flushingflushing consequently not flushed away with the flush water. processFragrance is not “decomposed” by cleaning preparation. Fragrance inCleaning product Optimized fragrance development, since fragrance istoilet bowl in toilet bowl released into the toilet bowl before flushingand is immediately during flushing consequently not flushed away withthe flush water. before use process Fragrance is not “decomposed” bycleaning preparation. Cleaning product Cleaning product Cleaning productA may prevent adhesions in the toilet A in toilet bowl B in toilet bowlbowl by a protective film of cleaning product A being immediately duringflushing applied in the toilet bowl immediately before the toilet isbefore use process used, which protective film is then flushed back offthe toilet surface by cleaning product B during the flushing process.

Another advantage is that a controlled release of one or more differentfragrances can be implemented, thereby at least reducing dependence onthe sense of smell. This can be accomplished by cyclic and pulsedrelease of fragrance as described in the prior art. Furthermore,dependence on smell can also be reduced by releasing differentfragrances in succession.

The toilet freshener can also dispense a defoamer into the toilet bowlbefore or during the flushing process. Excessive foaming before orduring the flushing process often causes toilet paper to float on thisfoam so that it is not properly flushed away, but instead floats in thetoilet bowl after completion of the flushing process. Consumers oftenconsider this unappealing. By dispensing the defoamer before or duringthe flushing process, excessive foaming can be prevented, ensuring thatthe toilet paper is reliably flushed away. In addition or as analternative to the defoamer, cellulose-dissolving substances may also beadded and dispensed.

The control unit can be constructed so that parameters in the dispensingprograms are adjustable or settable. For example, sensor thresholdvalues may accordingly be set during preconfiguration of the toiletfreshener or also by the user during use in order to initiate activesubstance release at a specific sensor threshold value. Setting one ormore parameters can be achieved by an appropriately configured inputdevice on the toilet freshener. Doing so allows control of the toiletfreshener to be further optimized and adapted to a specific instance ofuse.

Sensor Unit

The sensor unit can include one or more active and/or passive sensorsfor the qualitative and/or quantitative detection of mechanical,electrical, physical and/or chemical variables which are forwarded tothe control unit as control signals.

In particular, sensors of the sensor unit include timers, infraredsensors, brightness sensors, temperature sensors, motion sensors, strainsensors, rotational speed sensors, proximity sensors, flow sensors,color sensors, gas sensors, vibration sensors, pressure sensors,conductivity sensors, turbidity sensors, instantaneous acoustic pressuresensors, “lab-on-a-chip” sensors, force sensors, acceleration sensors,inclination sensors, pH sensors, moisture sensors, magnetic fieldsensors, RFID sensors, magnetic field sensors, Hall sensors, biochips,odor sensors, hydrogen sulfide sensors and/or MEMS sensors.

In its simplest embodiment, the sensor unit can be in the form of atoggle, pressure or momentary-contact switch.

For preparations whose viscosity fluctuates greatly as a function oftemperature, it is advantageous to provide flow sensors in thedispensing device for monitoring the volume or mass of the dispensedpreparations. Suitable flow sensors include diaphragm flow sensors,magnetic-inductive flow meters, mass flow metering using the Coriolismethod, eddy flow metering, ultrasound flow metering, rotametermetering, annular piston flow metering, thermal mass flow metering ordifferential pressure flow metering.

It is also possible to store a viscosity curve as a function oftemperature for at least one preparation to be saved in the controlunit, with dispensing being adjusted by the control unit in accordancewith the temperature and thus the viscosity of the preparation.

In a further development of the invention, a device is provided fordirect determination of the viscosity of the preparation.

The alternatives mentioned above for determining dispensing amountand/or viscosity of a preparation generate a control signal processed bythe control unit for controlling a pump, thereby inducing substantiallyconstant dispensing of a preparation.

In another preferred embodiment of the invention, the sensor isconfigured so that detection of a flushing process is achieved withoutany significant influence on flow conditions in the toilet bowl. Forexample, ultrasound sensors can be used for this purpose.

Furthermore, it is advantageous to have a dispensing process in which apredetermined amount of a preparation is released, for example, over atime of about 20 seconds or less, preferably about 10 seconds or less,particularly preferably about 5 seconds or less. By providing theshortest possible dispensing period in which a preparation is releasedinto the surrounding environment, the dispenser can be available for thenext dispensing period and also ensure effective release of preparation,even if a toilet is in continual use.

Power Source

For the purposes of the present application, a power source refers to acomponent of the dispensing device capable of providing power suitablefor autonomous operation of the dispensing device.

The power source preferably provides electrical power. The power sourcecan be, for example, a battery, a mains power supply, solar cells or thelike.

It is also possible to wirelessly transmit the electrical power requiredfor operating the dispenser from an appropriate transmitter to acorresponding receiver in the dispenser.

It is particularly advantageous to make the power source replaceable(e.g., in the form of a replaceable battery).

However, it is also possible for the power source to be a mechanicalpower source such as a dynamo, which converts mechanical or fluidicenergy into electrical power. This can then be stored in suitablestorage elements such as a capacitor or storage battery.

Container

For the purposes of the present application, a container refers to apackaging container suitable for enclosing or holding preparations, andwhich can be coupled to the dispenser for release of the preparation.

A particularly preferred arrangement is one in which two containers areprovided, preferably separate from one another, each containing anactive substance fluid. However, there can also be a plurality ofstorage containers for a plurality of active substance fluids. Thestorage containers can be separate from one another in order to preventpremature mixing of the active substance fluids. They can be physicallyseparate containers or separate compartments in a single container body.

The volume ratio of the structural volume of the dispenser and thecapacity of the container preferably amounts to <1, particularlypreferably <0.1, particularly preferably <0.05. This ensures that, for apredetermined overall structural volume of dispenser and container, thedominant proportion of the structural volume is occupied by thecontainer and the preparation contained therein.

The container can have a capacity of <5000 ml, in particular <1000 ml,preferably <500 ml, particularly preferably <250 ml, very particularlypreferably <50 ml.

The invention is suitable for dimensionally stable containers such aspots, tins, capsules, cartridges, bottles, canisters, cans, cartons,drums or tubes, but may also be used for flexible containers such aspouches or bags, particularly if they are used according to thebag-in-bottle principle.

A container can include a plurality of chambers fillable with differentcompositions. It is also possible for a plurality of containers to becombined into a unit (e.g., into a cartridge).

The following table provides examples of possible combinations ofcontainers or chambers with the corresponding preparations for someapplications.

Container A Container B Container C Cleaning agent Fragrance Cleaningagent A Cleaning agent B Cleaning agent A Cleaning agent B Fragrance

In a preferred embodiment of the invention, the container has an RFIDlabel containing at least information about the container's contents andwhich is readable by the sensor unit.

This information can be used to select a dispensing program stored inthe control unit. By doing so, it can be ensured that the idealdispensing program is always used for a specific preparation. It is alsopossible that, in the absence of an RFID label or when an RFID label hasan incorrect or defective ID, the dispensing device does not dispense,but instead an optical or acoustic signal is produced notifying the userof the error.

In order to prevent misuse of the containers, the containers can alsohave structural elements that interact with corresponding elements ofthe dispenser like a key in a lock, so that only containers of aparticular type are coupled to the dispenser. This embodiment makes itpossible for information about the container coupled to the dispenser tobe transferred to the control unit so that the dispensing device can becontrolled in a manner based on the contents of the correspondingcontainer.

In a further development of the invention, the container can be underpressure. This is useful when the preparation is sprayed or releasedwithout requiring a pump in between. Here, release of the preparationcan be controlled or regulated, for example, by a control valve inactive connection with the control unit. This embodiment has theadditional advantage that no power need be provided by the power sourcefor transporting the preparation, allowing the power source to be madesmaller or have a longer anticipated life.

Fastener

The toilet freshener can also include fasteners for fixing the toiletfreshener to the toilet bowl. Fasteners include suction cups, adhesivetape, clips or the like.

Alternatively, the toilet freshener can be fastened to the toiletcistern, the toilet seat or to the toilet lid. Fasteners known in theart can be used for this purpose.

Preparations

Preparations for the purpose of these applications are compositionswhich contain at least one substance from the group of cleaning agentsand/or fragrances.

According to a further, preferred development of the invention,preparations include substances for modifying surfaces, particularlyceramic surfaces.

Preparations suitable according to the invention include, for example,fragrance phases, particularly perfumed fragrance phases. Such fragrancephases typically contain at least one fragrance, preferably a perfumeoil, at least one surfactant or emulsifier, and water, as well asfurther optional ingredients such as preservatives, thickeners,complexing agents, dyes, further surfactants, or emulsifiers,stabilizers, limescale removers, etc.

Bleach phase preparations, in particular chlorine-containing bleachphases, preferably hypochlorite-based bleach phases, are likewisesuitable as preparations according to the invention, wherein, inaddition to the actual bleaching agent and water, the bleach phases cancontain further ingredients such as thickeners, surfactants oremulsifiers, neutralizing agents, dyes, fragrances etc.

Further preparations suitable according to the invention includelimescale removing active substance phases, preferably acidic limescaleremoving active substance phases. In addition to the actual limescaleremover (preferably comprising an organic or inorganic acid) and water,such limescale removing active substance phases can optionally containfurther ingredients such as surfactants or emulsifiers, thickeners,fragrances, preservatives etc.

It is also possible to use highly concentrated surfactant phases, or“foam boosters” as they are known, as preparations. In addition to thesurfactants, such highly concentrated surfactant phases can also containother conventional ingredients. Foam boosters are advantageous forpretreating the toilet bowl with a carpet of foam in order, for example,to prevent or reduce adhesion of excreted metabolites to the surface ofthe toilet and/or to trap malodors.

Preparations having an antibacterial and/or fungicidal and/or antiviralactive substance phase are likewise suitable, wherein in addition to theantibacterial and/or fungicidal and/or antiviral active substance andwater, the active substance phase can also contain other ingredientssuch as surfactants or emulsifiers, thickeners, fragrances,preservatives, etc.

It is also possible for the preparations to contain enzyme-containingactive substance phases. In addition to enzyme(s) and water, suchenzyme-containing active substance phases can optionally contain furtheringredients such as surfactants or emulsifiers, thickeners, fragrances,preservatives, etc.

It is likewise possible for preparations used according to the inventionto be absorbent, in particular odor-absorbing active substance phases.In addition to the absorbent, in particular, odor absorbent and water,these phases can also contain other ingredients such as surfactants oremulsifiers, thickeners, fragrances, preservatives etc.

According to one particular embodiment, the toilet freshener accordingto the invention allows the use of different combinations of differentpreparations in the storage containers, wherein one of the storagecontainers contains a fragrance phase as defined above.

Examples of useful preparation combinations include a perfumed fragrancephase combined with chlorine bleach (which are not stable when storedtogether), perfumed fragrance phase with highly concentrated surfactantphase (foam booster), fragrance phase with limescale removing, acidicactive substance phase, fragrance phase with antibacterial activesubstance phase, various acid systems, fragrance phase combined withenzyme-containing active substance phase, perfumed acid phase combinedwith water-coloring phase, fragrance phase with odor-absorbing phase,perfumed acid phase with active oxygen, perfumed acid phase with activesubstance phase, polyacrylate-thickened, etc.

Of particular interest are high-viscosity to gel-like active substancefluids having viscosities of a few thousand mPa·s, in particular fromabout 200 to about 5000 mPa·s, preferably about 500 to about 3500 mPa·s(measured with RotoVisko LVTV II, spindle 31, 5 rpm, 20° C.).

In a further, preferred embodiment of the invention, the preparationshave a viscosity of about 2000 mPa·s or less, in particular about 1000mPa·s or less (measured with RotoVisko LVTV II, spindle 31, 5 rpm, 20°C.). These low-viscosity to watery preparations are particularlysuitable if the preparation is sprayed into or onto the toilet bowl.

Using low-viscosity active substance preparations with toilet freshenersaccording to the invention allows for substantially faster and moreaccurate dispensing, as well as dispensing with the use of thickeningsystems. Furthermore, active substance systems which can only beprepared in low viscosities can be used, for example, based on chlorine,HCl, etc.

According to a further embodiment of the invention, the preparation canbe pressurized. This is advantageous when the preparation is sprayed orreleased without requiring a pump in between. Here, release of thepreparation can be controlled or regulated by a control valve activelyconnected to the control unit. This embodiment is further advantageousin that no power is required from the power source for transporting thepreparation, allowing the power source to be made smaller or have alonger anticipated life.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic block diagram of one embodiment of a toiletfreshener according to the present invention with a preparationcontainer on the suction side of the pump.

FIG. 2 is a schematic block diagram of one embodiment of a toiletfreshener according to the present invention with a preparationcontainer on the pressure side of the pump.

FIG. 3 is a schematic block diagram of one embodiment of a toiletfreshener according to the present invention with a two-chamberpreparation container on the suction side of the pump.

FIG. 4 is a schematic block diagram of one embodiment of a toiletfreshener according to the present invention with a passivevalve-controlled two-chamber preparation container on the suction sideof the pump.

FIG. 4A is a schematic block diagram of one embodiment of a toiletfreshener according to the present invention with an activevalve-controlled two-chamber preparation container on the suction sideof the pump.

FIG. 5 is a schematic block diagram of one embodiment of a toiletfreshener according to the present invention with two pump-connectedpreparation containers.

FIG. 6 is a flow chart illustrating one method of controlling a toiletfreshener according to the present invention with a pump.

FIG. 7 is a flow chart illustrating one method of controlling a toiletfreshener according to the present invention with a pump andmulti-chamber preparation container.

FIG. 8 is a flow chart illustrating one method of controlling a toiletfreshener according to the present invention with a plurality of pumpsand multi-chamber preparation container.

FIG. 9 is a schematic block diagram of one embodiment of a toiletfreshener according to the present invention with an RFID label on apreparation container.

FIG. 10 is a schematic block diagram of one embodiment of a toiletfreshener according to the present invention with a removable refillcontainer.

FIG. 11 is a schematic block diagram of one embodiment of a toiletfreshener according to the present invention with a refill containerfixed to a dispenser.

FIG. 12 is a schematic block diagram of one embodiment of a toiletfreshener according to the present invention with a battery built intothe refill container.

FIG. 13 is a schematic block diagram of one embodiment of a toiletfreshener according to the present invention with a two-chamber refillcontainer and two pumps.

FIG. 14 is a schematic block diagram of one embodiment of a toiletfreshener according to the present invention with a two-chamber refillcontainer, pump, and control valve.

FIG. 15 is a perspective view of one embodiment of a toilet fresheneraccording to the present invention with an extendible clip.

FIG. 16 is a perspective view of one embodiment of a toilet fresheneraccording to the present invention with a removable container and wicksystem.

FIG. 17 is a side view of one embodiment of a toilet freshener accordingto the present invention with a release element arranged at the end ofthe clip.

FIG. 18 is a top view of one embodiment of a toilet freshener accordingto the present invention with a release element arranged at the end ofthe clip, with the freshener attached to a toilet bowl.

FIG. 19 is a perspective view of one embodiment of a toilet fresheneraccording to the present invention with individually replaceablecontainers.

FIG. 20 is a perspective view of one embodiment of a release elementaccording to the present invention with integrated sensor unit and tworelease nozzles.

FIG. 21 is a perspective view of one embodiment of a release elementaccording to the present invention with integrated sensor unit, tworelease nozzles and two spray cones.

FIG. 22 is a perspective view of one embodiment of a toilet fresheneraccording to the present invention with release element and two spraycones, looking down onto a toilet bowl.

FIG. 23 is a side view of one embodiment of a toilet freshener accordingto the present invention with release element arranged under the toiletrim and two differently oriented spray cones.

FIG. 24 is a side view of one embodiment of a toilet freshener accordingto the present invention with the release element arranged under thetoilet rim and a spray cone directed under the rim of the toilet.

FIG. 25 is a perspective view of one embodiment of a toilet fresheneraccording to the present invention with two individually replaceablecontainers and a viewing flap in closed and open positions.

FIG. 1 shows a toilet freshener 1 according to the invention consistingof a dispenser 2 and a container 9 connected to the dispenser 2 andcontaining a preparation 10.

The dispenser 2 includes a power source 3, control unit 4, sensor unit 5and pump 6, wherein all components are preferably incorporated in ahousing. The pump 6 is connected to the power source 3 via the controlunit 4. The control unit 4 is in turn connected with the sensor unit 5,which directs the control signals for controlling the pump 6 to thecontrol unit 4.

The pump 6 has a pressure line 7 and a suction line 8, with the suctionline 8 connected to the container 9 containing the preparation 10. Thepump 6 delivers the flowable preparation 10 via the suction line 8 fromthe container 9 into the pressure line 7, from which the preparation 10is released into the surrounding environment of the toilet freshener 1.The pressure line 7 can be configured so that it counteracts gelation ofthe released preparation (e.g., by selection of a suitable diameter).

The container 9 can have a pressure equalizing valve 11 for equalizingthe pressure between the surrounding environment and the interior of thecontainer 9 when the pump 6 is pumping preparation 10 out of thecontainer 9.

The pump 6 can be actuated by the control unit 4 so that the deliverydirection of the pump 6 is reversed, and preparation still present inthe pump 6 and lines 7 and 8 is delivered back into the container 9.This back-flushing can be advantageous when the preparation 10 thickens,clogging the lines 7 or 8.

FIG. 2 shows a further embodiment of the dispensing device of FIG. 1wherein the container 9 is connected to the pressure side of the pump 6.Here, the pump 6 builds up pressure in the container 9 by pumpingambient air into the container 9, thereby expelling the preparation fromthe container 9. A valve 11 can be provided on the preparation outletside of the container 9, permitting release of the preparation 10 fromthe container 9 once a defined pressure is achieved in the container 9.This can be useful when dispensing is by a defined spray jet or spraymist, and not dropwise.

In addition, a non-return valve 11 a can be provided in the pressureline 7 between the pump 6 and the container 9, preventing pressure builtup in the container 9 from escaping through the pressure line 7 when thepump 6 is at a standstill.

FIG. 3 shows the dispenser 2 of FIG. 1 wherein a two-chamber containerformed from the containers 9 and 13 is connected to the suction line 8of the pump 6. The containers 9 and 13 can each contain differentcompositions 10 and 14.

The containers 9 and 13 can each have pressure equalizing valves 11, 12.

The outlet openings at the bottom of the containers 9 and 13 areconnected to the suction line 8 and pump 6 so that the preparations 10and 14 are pumped through the suction line 8 in a defined ratio to oneanother. It may be necessary to adjust the flow conditions in thepressure lines 8 leading to the outlet openings at the bottom of thecontainers 9 and 13.

When more than two different preparations 10 and 14 are used, it isadvantageous to control dispensing so that two mutually compatiblepreparations are delivered in succession through the lines 7, 8 and thepump 6.

Incompatibility of two preparations can result in, for example, anexothermic reaction, thickening, flocculation, pH value modification,color change or the like.

A third container can be provided that contains a flushing fluid forcleaning at least one of the preparations 10, 14 from the lines 7, 8 andthe pump 6. Air can also be used for flushing the lines 7, 8 and thepump 6. By flushing the lines 7, 8 and the pump 6, it is possible toprevent residues of mutually incompatible preparations from coming intocontact.

FIG. 4 illustrates a further development of the toilet freshener 1 ofFIG. 3. The pressure lines 8 leading to the outlet openings at thebottom of the containers 9 and 13 each have a passive valve 15 and 16,allowing defined setting of the dispensing ratios of the preparations 10and 14 from the containers 9 and 13.

The valves 15 and 16 can also be designed as temperature-sensitivebimetallic valves that open or close when a defined temperature isreached. In particular, the valves 15 and 16 can be different bimetallicvalves so that, for example, only one preparation is delivered by thepump 6 from one of containers 9 or 13 once a defined temperature hasbeen reached.

A common feature of the dispensers according to FIGS. 1-4 is that thecontrol unit 4 controls the pump 6 by processing the signals from thesensor unit 5.

A basic control algorithm 20 is shown in FIG. 6 as a flow diagram.

The control algorithm 20 is activated as soon as the dispenser 2 isswitched on. In a first process step 22, the control unit 4 receives thesignals from the sensor unit 5. In the control unit 4, the receivedsensor signal is compared with a threshold value stored in the controlunit 4.

In the following process step 24, a selection condition is used to checkwhether the sensor signal and the threshold value are in a definedrelationship to one another. If the condition is met, the pump 6 is thenactivated by process step 25. If the condition is not met, sensorsignals continue to be received and evaluated by the control unitaccording to process step 22.

As can be seen from process steps 25-29, the pump 6 remains in anactivated state until a sensor signal arises which, on comparison with athreshold value stored in the control unit 4, causes the micropump to beswitched off. According to this procedure, preparation is pumped out ofthe containers for as long as the sensor signal varies between twopredefined threshold values, respectively, for switching the pump 6 onand off.

Alternatively, it is also possible to modify the above describedcontroller so that a simple trigger circuit is created wherein switchingon the micropump according to process step 25 causes a release of apredetermined amount of preparation, and then automatically switches offthe micropump without requiring a further, sensor signal-based switchingoff condition for the pump 6.

As shown in FIG. 4A, it is also possible to configure the valves 15 and16 as components actively controlled by the control unit 4. In thismanner, the mixing ratio of the two preparations 10 and 14 can beactively influenced in a time-variable manner.

The control scheme underlying this embodiment is shown in FIG. 7 by flowdiagram 30.

FIG. 5 shows a further possibility for actively influencing the mixingratios in time-variable manner. In this embodiment of the invention,each of the containers 9 and 13 is coupled with a pump 6 and 19 to beindividually controlled by the control unit 4. The corresponding controlalgorithm is shown in FIG. 8.

FIG. 9 shows the dispensing device of FIG. 1 wherein an RFID label 42suitable for identifying the size and the contents 10 of the container 9is arranged on the container 9.

The sensor unit 5 includes an RFID receive unit capable of readinginformation from the RFID label 42 arranged on the container 9. Thisinformation is relayed as a control signal to the control unit 4 toinitiate dispensing of the preparation 10 based on the contents of thecontainer 9. In particular, control signals triggered by the RFID label42 can be used to select a dispensing program stored in the controlunit.

In this way, a multipurpose dispenser for a plurality of dispensingapplications is provided, such as for the dispensing of preparations indishwashers, washing machines, dryers, toilets or living spaces.

As an alternative to the RFID label 42, a person skilled in the art canalso provide other means to bring about automatic identification of thecontainer 9 and its contents 10 by the dispenser.

Furthermore, an additional release device 43 can be provided at thepressure-side opening of the pressure line 7. This release device 43provides distribution of the preparation into the surroundingenvironment of the dispensing device 1 in a manner different fromdropwise release. This can, for example, include jet- or spray mist-likerelease of the preparation, or release based on vaporization ordiffusion. The release device 43 can be in the form of a nozzle,atomizer, distributor plate or porous surface. In particular, therelease device can be configured to counteract gelation of the releasedpreparations.

FIG. 10 shows the toilet freshener of FIG. 1 with a container 9detachable from the dispenser 2. The container 9 has at its lower,bottom end a connection port 47 which can be introduced into thereceptacle 48 provided on the dispenser 1. The connection port 47 can beclosed by closure means so that initially, in the unused state of thecontainer 9, leakage of preparation 10 from the container 9 isprevented; however, by inserting the container 9 into the dispenser 2 orthe connection port 47 into the receptacle 48, the closure means isdestroyed, allowing release of the preparation 10 from the container 9by the dispenser 2 into the surrounding environment. FIG. 11 shows thetoilet freshener in its assembled state.

The control unit 4 can also be coupled with an acoustic transducer 46which converts a voltage or current of the control unit into an audibleacoustic signal. The control unit 4 may include memory for a pluralityof acoustic signals and/or music and/or speech recordings, which can beretrieved and executed manually or on the basis of a sensor triggersignal (L e., forwarded to the acoustic transducer 46).

A light 44 can be connected to the control unit 2, wherein the light 44is turned on or off in accordance with a predefined operating state ofthe dispensing unit 2. The light can take the form of, for example, anLED or LCD display.

The dispenser 2 can be switched on or off with the actuating element 45.It is also possible for different programs stored in the control unit 4to be retrieved and executed by the actuating element 45.

FIG. 12 shows a further development of the toilet freshener according tothe invention wherein the power source 3 in the form of a battery isincorporated in the container 9. The battery 3 is electricallyconductively connected to the dispenser 2 via an appropriatelyconfigured coupling. The capacity of the battery 3 is designed to supplythe dispenser 2 with power over the period of use until the preparation10 has been completely emptied from the container 9.

FIG. 13 shows the structure of the toilet freshener illustrated in FIG.5 in a more detailed schematic diagram. The chamber 9 is subdivided intotwo chambers by the wall 49 in which a first preparation 10 and a secondpreparation 14 are stored. Each chamber communicates with thesurrounding environment via a pressure equalizing valve 11 or 12, andeach has at its bottom end a connection port 47 a or 47 b.

FIGS. 15-17 show a further embodiment of the toilet freshener accordingto the invention. The toilet freshener includes the dispenser 2 and thecontainer 9, which is detachably fixed to the dispenser 2. The dispenserhas a raised rear wall from which extends perpendicularly the fasteningmeans 52 in the form of a clip. The clip 52 is positioned between therim of the toilet and the toilet seat, where it is fixed to the toiletbowl by the toilet seat resting on it. As is seen from FIG. 17, asuction cup can also be provided on the dispenser for additionallysecuring the toilet freshener to the toilet by vacuum.

A pressure or strain sensor is arranged as a sensor unit 5 on theupwardly directed top side of the fastening means 52. When pressure isexerted on this sensor unit 5 (e.g., by someone sitting on a toiletseat), the sensor unit 5 generates a corresponding signal that isrelayed to the control unit 4 of the dispenser 2.

The container 9 can be separable from the dispenser, as seen in FIG. 16.The container 9 includes a wick system 50 in its interior, by which thepreparation is released by the release element 43 a from the container 9into the surrounding environment by evaporation. The connection port 47and receptacle 48 in the dispenser 2 form a liquid-tight connection whencontainer 9 and dispenser 2 are in the assembled state.

A release element 43 in the form of a nozzle head is provided on theclip 52. The nozzle head 43 is arranged in a movable manner on the clip52, allowing it to be oriented by the user. A telescopic element 53 isarranged between the nozzle head 43 and clip 52, allowing the length ofthe clip 52 and thus the point of application of the nozzle head 43 tobe set. The nozzle head 43 produces a spray cone 54 from thepreparation, which, as seen in FIG. 18, wets a defined application fieldwithin the toilet bowl 55.

A further, alternative development of the toilet freshener according tothe invention is shown in FIG. 19. In this embodiment, the containers 9and 13 are firmly connected with the dispenser 2 and can be refilled viaan opening (not shown in FIG. 19).

FIG. 20 shows a release element 43 arranged at the distal end of theclip 52 with an integrated sensor 5 and two nozzles 56 and 57. In thisembodiment, the sensor 5 is in the form of an infrared sensor orultrasound sensor.

The nozzles 56 and 57 can be configured to produce identical ordifferent spray cones 54 a, 54 b, as illustrated in FIG. 21. As shown inFIG. 22, the spray cones 54 a and 54 b can be directed onto the sameapplication field in the interior of a toilet bowl 55. However, it isalso apparent from FIGS. 23 and 24 that it is possible to direct the twospray cones in different directions.

In the embodiment shown in FIG. 23, the release element 43 is fixed by ahook on the inside on the lower rim of the toilet bowl 55. The releaseelement 43 is therefore displaceably arranged on the clip 52, asindicated by the arrow in FIG. 23. In addition, the toilet freshener 1is fixed by the fastening means 50, here in the form of a suction cup,to the external rim of the toilet bowl 55.

The release element 43 has a first nozzle 56 and a second nozzle 57spaced apart and arranged in the release element 43 so that theirrespective spray cones 54 a and 54 b point in different, non-overlappingdirections. Spray cone 54 a from the first nozzle 56 is accordinglydirected into the interior of the toilet bowl 55, while spray cone 54 bfrom the second nozzle 57 is directed onto the rim of the toilet bowl.It is also possible, as shown in FIG. 24, for a spray cone 54 b to bedirected under the rim of the toilet bowl 55. The spray cones 54 a and54 b can be from identical or different compositions.

A sensor unit 5 in the form of a capacitive sensor projects from therelease element under the rim of the toilet 55, such that the sensor 5is exposed to water when flushing is actuated. The sensor 5 is shaped sothat it has no significant influence on the path of the flushing waterin the toilet bowl 55.

FIG. 25 shows a further development of the containers 9 and 13 and ofthe dispenser 2. The receptacle for the containers 9 and 13 in thedispenser is closable by a flap 58 arranged swivelably on the dispenser2. With the flap 58 in the open state, the two containers 9 and 13 maybe separately removed from or inserted into the receptacle of thedispenser 2.

FIG. 25 shows in a further embodiment of a toilet freshener 1 having twoindividually replaceable containers 9 and 13 and a viewing flap 58 inclosed and in open position. The viewing flap 58 is hinged to the rearwall of the toilet freshener and shaped so that the viewing flap 58preferably completely covers the containers 9 and 13 inserted in thetoilet freshener 1. The viewing flap 58 can be equipped with closureswhich permit child-proof closure of the viewing flap 58 with the toiletfreshener, thereby preventing unintended access to the containers 9 and13.

The lights 44 and actuating element 45 are arranged on the front of thetoilet freshener so that they are not covered when the inspection orviewing flap 58 is closed, but are instead freely accessible.

1. Toilet freshener for introducing at least one active substancepreparation into a toilet bowl, comprising: a power source, a controlunit, a sensor unit, at least one first container containing a firstpreparation, wherein the first container can be coupled to the toiletfreshener, and at least one release element for at least one activesubstance preparation, the release element being connected incommunicating manner to the at least one first container and configuredso that active substance is released onto at least one application fieldlocated inside the toilet bowl.
 2. Toilet freshener according to claim1, wherein the release element is a nozzle, spray head, foam spray headand/or piezo element.
 3. Toilet freshener according to claim 1, whereinthe at least one release element is at least two release elementsconnected in communicating manner to a container.
 4. Toilet fresheneraccording to claim 1, wherein the at least one first container furthercomprises at least one second container containing a second composition,wherein the at least one second container can be coupled to the toiletfreshener.
 5. Toilet freshener according to claim 1, wherein the atleast one release element is connected in communicating manner to atleast one first container, and further comprising at least one secondrelease element connected in communicating mariner to at least onesecond container.
 6. Toilet freshener according to claim 3, wherein theat least one and two release elements have substantially identical spraycone shapes.
 7. Toilet freshener according to claim 3, wherein the atleast one and two release elements have different spray cone shapes. 8.Toilet freshener according to claim 1, wherein the at least one releaseelement further comprises an electrostatical charger for charging theactive substance preparation for application.
 9. Toilet fresheneraccording to claim 3, wherein the at least one and two release elementsare directed onto mutually different application fields.
 10. Toiletfreshener according to claim 9, wherein at least one application fieldis located outside the toilet bowl.
 11. Toilet freshener according toclaim 9, wherein at least one application field is located under thetoilet rim.
 12. Toilet freshener according to claim 1, furthercomprising a clip, wherein the release element is movably arranged onthe clip and the clip is connected to the dispenser.
 13. Toiletfreshener according to claim 1, wherein the one active substancepreparation comprises a cleaning agent for applying into an applicationfield inside the toilet bowl.
 14. Toilet freshener according to claim 1,wherein the at least one active substance composition comprises afragrance for applying into an application field outside the toiletbowl.
 15. Toilet freshener according to claim 1, wherein the dispenseris arranged on the outer rim of the toilet bowl.
 16. Toilet fresheneraccording to claim 1, wherein the pump and/or the release element and atleast the first preparation are configured so that foam is formed onrelease of the preparation into the surrounding environment.
 17. Toiletfreshener according to claim 1, wherein the release element is movablyarranged on the toilet freshener, thereby allowing a user to orient aspray cone producible by the release element onto a desired applicationfield.